Puanoqraph co



H. HAMPE.

BACKING-OFF LATHE.

APPLICATION FILED JUNE 5.1918.

l ,320,468. Patented Nov. 4, 1919.

'we COLUMBIA PLANouwAr'N co., WASHINGTON, D. c.

H. HAMPE.

BACKING-OFF LATHE.

APPLICATIQN FILED JUNE 5.1918.

yEatented Nov. 4,1919- 3 SHEETS-SHEET 2.

H. HAMFE.

BACKING- oFF LATHE` APPLICATIONILED JUNE 5. 1918.

LSZGSS@ Patented Nov. 4, 1919.

3 SHEETS-SHEET 3.

fig.

TATS

BACKINGr-OFF LATHE.

Speccaton of Letters Patent.

Patented Nov. 4, 1919.

Application led .Tune 5, 1918. Serial No. 238,338.

To all whom it may concern:

Be it known that I, HoNoR HAMPE, a citi- Zen of the Republic of France,residing at 6 Rue de lUrbaine, Neuilly-sur-Seine, France, have inventedcertain new and useful Improvements in Backing-Off Lathes, of which thefollowing is a specification.

The present invention relates to backing offl lathes and is animprovement on existing lathes of a similar type.

The drive of various members is obtained by means of a main drivingshaft carrying three toothed pinions which each drive a group ofdifferent members. This method of grouping effects an easier and quieteroperation of the lathe. The controlling shaft of all the members rotatesthe quickest and all the drives are effected through speed reducinggearing so that there is thus obtained' in the present lathe, movementswhich permit of the execution of precision work Without jerks or shocks.

The distribution of the driving force is directed from the maincontrolling shaft to the three essential members of the machine.

The first pinion on the general controlling shaft drives through agearing which transmits the desired reduction in speed lto the spindleof the fixed headstock.

The second pinion on the main controlling shaft drives the lead screwfor the longitudinal movement of the saddle through a reversingarrangement and gearing.

The third pinion on the main controlling shaft drives thev cani for themovement of the saddle through differential gear, helicoidal gearing, aworm and gearing.

The differential gear serves to give to the backing off saddle amovement in advance or a delayed movement so as to follow the helix ofthe cutters with the lead screw.

The arrangement of this member between the main driving shaft of themachine and the backing off cam characterizes the pres-- ent invention.

The general controlling shaft carries a l The exterior of the saddlecarries a scale which indicates the depth to which the cutting isadjusted.

Figure 1 of the accompanying drawing is a longitudinal vertical sectionof the machine.

F ig. 2 is a vertical section on the line JL-'6.

3 is a'horizontal section on the line Fig. 4 drawn to an enlarged scaleis a cross section of the saddle on the line c-/.

Fig. 5 is an end View of the saddle drawn to the same scale as that ofFig. 4.

The frame A of the lathe Figs. 1, 2, 3, 4, 5 is fitted as a single piecewith the body of the fixed head-stock as in an ordinary lathe.

The spindle B, Fig. 1 of the fixed headstock is constructed as in alathe.

The same applies to the tail-stock C, Fig. 1.

The spindle B Fig. 1 carries a large toothed driving wheel D, Figs. 1and 2, which receives its movement from a pinion E, Fig. 2.

The pinion E is secured to its shaft which carries at its end aremovable toothed wheel F. j

The wheel F receives its movement from a pinion C, Figs. 1, 2, throughthe toothed wheels H and I integral with or secured to each other. Thewheels H and I are arranged on a radial or change gear plate .I fixed tothe back of the lathe A. The wheels F, H and I can be replaced by otherwheels having a greater or less number of teeth so that the speed ofrotation of the spindle B can be varied relatively to the main drivingshaft K, Figs. l, 2 and 3. According to the' number of teeth of thecutter that it is desired to back off the relation above indicated isvaried as desired.

The main driving shaft K carries a stepped pulley L Figs. 1 and 3 whichis rotated in any suitable manner. On the main driving shaft K are fixedtwo other pinions M, N, Fig. 3 one of which M controls the lead screw Vthrough the reversing gear O, Fig. 1, its shaft P, Fig. l, gear Q, andthe gearR, Figs. 2 and 3, and the other pinion N drives the cam S of thereproducing carriage through the wheel T, Figs. 1 and 2 the bevel wheelU integral therewith planetary pinions W of the difrferential gear andthe shaft Y.

The wheel T rigid with the bevel wheel IU andthe worm wheel l" turns onthe shaft Z which is supported in the frame A of the lathe. The wormwheel I" communicates its movement to the helicoidal pinion R with whichit gears. The pinion R is Ykeyed on the shaft Q which communicates itsrotational movement to the shaft O Fig. 1 through the gear P Figs. l and3. shaft O is provided with a worm'V which drives the wheel N rigid withthe bevel pinion U which communicates this move- -ment to the bevelplanetary pinions IV of the differential. According to the nature of thegear P, the bevel pinion U receives a Vmovement in proportion to that ofthe bevel pinion U. The proportion of the teeth'on 4the gear P iscalculated according to the pitch of the helix of the cutter to beformed.

For backing off straight cutters the movement of the bevel pinion V isblocked and the gear P is disengaged from its wheels. The lshaft Q andthe helicoidal wheel R turn freely during this operation.

The cam S of the reproducing saddle is arranged on the feathered shaft Yon which it can slide in accordance with the longitudinal movement ofthe saddle.

The cam S actuates the lever A Fig. 4 through a tappet B.

The lever A is articulated on the base C of the reproducing saddle D.rIhe base C of the saddle can turn about the aXis g/-y inV order to givevarious inclinations in a horizontal plane to the saddle D and the baseC. v

On the reproducing saddle VD Fig 4 is fixed a grooved support E in whichthere slides a guide block F.

By means of the screw u which is heldin the direction of its length bythe cover piece p, the slide block F can be adjusted in the support Ealong the face of the lever A. When the slide blockF is lowered itapproaches the point of contact with the lever atrthe center andconsequently diminishes .the stroke of the saddle D andv inversely whenthe slide block is raised. rlhe slideblock F support N and the saddle DYare returned into contact with the lever A by thespring G.

The backing off saddle D Fig.. 5 and its basef C carrydivisions whichrindicate the The.

stroke and which is made by the backing off saddle D according to theposition of the slide'block F. In order to account for the stroke of thesaddle D, it is pushed from the dead point position to the right in Fig.5. The saddle is arranged to receive a double tool carrying rest or anyother arrangement of rotatable saddle or reproducer.

What I claim is l. In a lathe of the `class described, a spindle, a maindriving shaft, variable speed gears connecting said spindle and shaft; alead screw, gears, including ay differential, connecting the lead screwand said main driving shaft; a cam shaft, gears including a differentialconnecting tlie'cam shaft with the main driving shaft, a cam mounted forturning movement with and for longitudinal movement on the cam shaft; abase mounted for longitudinal movement and having a nut arranged on thelead screw, a reproducing saddle on the base, and a lever and tappet to`cause said saddle to be operated by the cam. Y f

2. In a lathe of the class described, a spindle, a main driving shaft,variable speed gears connecting said spindley and shaft; a lead screw,gears, including a differential, connecting the lead screw and saidshaft; a cam shaft gears including a differential connecting thecamshaft with "the main driving shaft,ra cam mounted-for turningmovement with and for longitudinal movement on the cam shaft; a basemovable -by the lead screw, a lever articulated on the base, areproducing saddle on the base, a support on the saddle, a guide blockmounted on said support' for sliding movement on the saddle, means toadjust the guide block along the face of the lever to predetermine thestroke `of the saddle, a tappet to cause the cam to operateJ the lever,andaspring acting'on the saddle to impart Vreturn movement thereto.

Y In testimonywhereof I have hereunto set my hand, in presence of twosubscribing witnesses.Y Y

Y HONORE HAMPE.

`Witnesses:

PIERRE LEJARD, CHAs. P PRnssLY.

Copies of this patent may be obtained for-five cents each, by addressingthe Commissioner of at'ent's,

f Y Washington, D. C. l

